Hi Ive just worked out how you can do this on your iphone. I switched from irish to uk account.

Go to Settings At top of page where your name appears with apple ID, icloud,iTunes click here Scroll to bottom of page and sign out.

Now go to app store and update all your apps.

Once done sign back into your apple account on your device.

You can do this on your iphone by switching from the Irish to UK account.

1. Go to Settings
2. Tap on your name at the top of the page
3. Scroll to the bottom of page and sign out
4. Now go to the app store and sign in to the UK account
5. Update all your apps

Once done sign back into your usual account.